1 /* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; version 2 dated June, 1991, or
6 (at your option) version 3 dated 29 June, 2007.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include <netinet/icmp6.h>
23 static int ping_id = 0;
25 void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force)
27 struct slaac_address *slaac, *old, **up;
28 struct dhcp_context *context;
31 if (!(lease->flags & LEASE_HAVE_HWADDR) ||
32 (lease->flags & (LEASE_TA | LEASE_NA)) ||
33 lease->last_interface == 0 ||
37 old = lease->slaac_address;
38 lease->slaac_address = NULL;
40 for (context = daemon->dhcp6; context; context = context->next)
41 if ((context->flags & CONTEXT_RA_NAME) &&
42 !(context->flags & CONTEXT_OLD) &&
43 lease->last_interface == context->if_index)
45 struct in6_addr addr = context->start6;
46 if (lease->hwaddr_len == 6 &&
47 (lease->hwaddr_type == ARPHRD_ETHER || lease->hwaddr_type == ARPHRD_IEEE802))
49 /* convert MAC address to EUI-64 */
50 memcpy(&addr.s6_addr[8], lease->hwaddr, 3);
51 memcpy(&addr.s6_addr[13], &lease->hwaddr[3], 3);
52 addr.s6_addr[11] = 0xff;
53 addr.s6_addr[12] = 0xfe;
55 #if defined(ARPHRD_EUI64)
56 else if (lease->hwaddr_len == 8 &&
57 lease->hwaddr_type == ARPHRD_EUI64)
58 memcpy(&addr.s6_addr[8], lease->hwaddr, 8);
60 #if defined(ARPHRD_IEEE1394) && defined(ARPHRD_EUI64)
61 else if (lease->clid_len == 9 &&
62 lease->clid[0] == ARPHRD_EUI64 &&
63 lease->hwaddr_type == ARPHRD_IEEE1394)
64 /* firewire has EUI-64 identifier as clid */
65 memcpy(&addr.s6_addr[8], &lease->clid[1], 8);
70 addr.s6_addr[8] ^= 0x02;
72 /* check if we already have this one */
73 for (up = &old, slaac = old; slaac; slaac = slaac->next)
75 if (IN6_ARE_ADDR_EQUAL(&addr, &slaac->addr))
78 /* recheck when DHCPv4 goes through init-reboot */
81 slaac->ping_time = now;
90 /* No, make new one */
91 if (!slaac && (slaac = whine_malloc(sizeof(struct slaac_address))))
93 slaac->ping_time = now;
96 /* Do RA's to prod it */
97 ra_start_unsolicited(now, context);
102 slaac->next = lease->slaac_address;
103 lease->slaac_address = slaac;
107 if (old || dns_dirty)
110 /* Free any no reused */
111 for (; old; old = slaac)
119 time_t periodic_slaac(time_t now, struct dhcp_lease *leases)
121 struct dhcp_context *context;
122 struct dhcp_lease *lease;
123 struct slaac_address *slaac;
124 time_t next_event = 0;
126 for (context = daemon->dhcp6; context; context = context->next)
127 if ((context->flags & CONTEXT_RA_NAME) && !(context->flags & CONTEXT_OLD))
130 /* nothing configured */
137 for (lease = leases; lease; lease = lease->next)
138 for (slaac = lease->slaac_address; slaac; slaac = slaac->next)
140 /* confirmed or given up? */
141 if (slaac->backoff == 0 || slaac->ping_time == 0)
144 if (difftime(slaac->ping_time, now) <= 0.0)
146 struct ping_packet *ping;
147 struct sockaddr_in6 addr;
151 if (!(ping = expand(sizeof(struct ping_packet))))
154 ping->type = ICMP6_ECHO_REQUEST;
156 ping->identifier = ping_id;
157 ping->sequence_no = slaac->backoff;
159 memset(&addr, 0, sizeof(addr));
160 #ifdef HAVE_SOCKADDR_SA_LEN
161 addr.sin6_len = sizeof(struct sockaddr_in6);
163 addr.sin6_family = AF_INET6;
164 addr.sin6_port = htons(IPPROTO_ICMPV6);
165 addr.sin6_addr = slaac->addr;
167 if (sendto(daemon->icmp6fd, daemon->outpacket.iov_base, save_counter(-1), 0,
168 (struct sockaddr *)&addr, sizeof(addr)) == -1 &&
169 errno == EHOSTUNREACH &&
170 slaac->backoff == 12)
171 slaac->ping_time = 0; /* Give up */
174 slaac->ping_time += (1 << (slaac->backoff - 1)) + (rand16()/21785); /* 0 - 3 */
175 if (slaac->backoff > 4)
176 slaac->ping_time += rand16()/4000; /* 0 - 15 */
177 if (slaac->backoff < 12)
182 if (slaac->ping_time != 0 &&
183 (next_event == 0 || difftime(next_event, slaac->ping_time) >= 0.0))
184 next_event = slaac->ping_time;
191 void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases)
193 struct dhcp_lease *lease;
194 struct slaac_address *slaac;
195 struct ping_packet *ping = (struct ping_packet *)packet;
198 if (ping->identifier == ping_id)
199 for (lease = leases; lease; lease = lease->next)
200 for (slaac = lease->slaac_address; slaac; slaac = slaac->next)
201 if (slaac->backoff != 0 && IN6_ARE_ADDR_EQUAL(sender, &slaac->addr))
205 inet_ntop(AF_INET6, sender, daemon->addrbuff, ADDRSTRLEN);
206 if (!option_bool(OPT_QUIET_DHCP6))
207 my_syslog(MS_DHCP | LOG_INFO, "SLAAC-CONFIRM(%s) %s %s", interface, daemon->addrbuff, lease->hostname);
210 lease_update_dns(gotone);